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안계혁,Cheol-Min Yang,Kwanyong Seo,박경아,이영희 한국물리학회 2006 Current Applied Physics Vol.6 No.1l
We have reported the density-functional calculations of NO2 that NO2 adsorption is strongly electronic structure- and strain-dependent. The NO2 adsorption on metallic nanotubes (m-SWCNTs)was energetically more favorable than that on semiconducting nanotubes (s-SWCNTs) and furthermore the adsorption became less sta-ble with increasing diameters of nanotubes. The adsorption barrier height shows similar dependence on the electronic structure anddiameter to the adsorption energy. On the base of our theoretical model, we have found a method for a diameter-selective removaltetramethylene sulfone (TMS)/chloroform solution with nitronium hexauoroantimonate (NO2SbF6: NHFA) and nitronium tetrauo-roborate (NO2BF4: NTFB). Positively charged nitronium ions were intercalated into nanotube bundles, where the intercalation was pro-moted also by the counter ions. Nitronium ions selectively attacked the sidewall of the m-SWCNTs due to the abundant presence ofelectron density at the Fermi level, thus yielding stronger binding energy compared to the counterpart s-SWCNTs. The s-SWCNTs wereremoving m-SWCNTs was conrmed by the resonant Raman spectra and absorption spectra.
이혜민,안계혁,박수진,김병주 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
In This work, activated porous hard carbon (APH) electrodes with high double layer capacitance and good rate capability were prepared from polymer by optimizing the carbonization temperature prior to steam activation. The surface morphologies and structural characteristics of APHs were investigated by SEM and XRD, respectively. Textural properties of the APHs prepared were investigated by N2/77K adsorption isotherms. It was also observed that various pore size distribution were found to be depended on the functions of carbonization temperature. The carbonization temperature has a marked effect on both the pore structure, and the electrochemical performances of the APHs.
Surface-Anodized carbon fibers
김동규,안계혁,김병주 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
In this work, carbon fibers were anodized with ammonium bicarbonate (ABC) as an electrolyte in various current densities. The changes in surface roughness, oxygen functional groups, and surface free energy of the carbon fibers were studied to understand surface energetics of carbon fibers in the relation of filler-matrix adhesion. SEM, FT-IR, EFM, XPS, and contact angle measurement were employed to analyze the carbon fibers after surface anodizing. As a result, the surface free energy of the carbon fiber was changed by oxygen containing functional groups and surface roughness after the anodic oxidation treatments.